Toyota recommends 5w-30 oil, but doesn’t have one in PK. LOL.
Petron is 20w-50 & Petron Plus is 10w-30. Let me call it, these are oils for old engines.
Taglon is 5w-50 is good but very expensive.
If you want to stick with Toyota, then try to find their 4L Tin Pack 5w-30 of SL grade.
Its blended in Japan and mineral oil. You can use and change it after 4~5K. Price should be Rs. 2500~2600 only.
Or you can use Taglon (price is 4000~4500) and change it after 5~6K.